In ASCII, characters all have underlying integer values of 0 through 127 inclusive. Characters are numbers. We can use Swift 5.8 to print an ASCII table.
With a for-loop, and UnicodeScalar, we can generate a simple ASCII table in Swift. Another tutorial converts characters and Ints. This helps when handling ASCII.
On UnicodeScalar, we can call the escaped() method to display ASCII characters on the console. This can help with debugging—output is easier to read.
# ASCII
0 \0
1 \u{01}
2 \u{02}
3 \u{03}
4 \u{04}
5 \u{05}
6 \u{06}
7 \u{07}
8 \u{08}
9 \t
10 \n
11 \u{0B}
12 \u{0C}
13 \r
14 \u{0E}
15 \u{0F}
16 \u{10}
17 \u{11}
18 \u{12}
19 \u{13}
20 \u{14}
21 \u{15}
22 \u{16}
23 \u{17}
24 \u{18}
25 \u{19}
26 \u{1A}
27 \u{1B}
28 \u{1C}
29 \u{1D}
30 \u{1E}
31 \u{1F}
32
33 !
34 \"
35 #
36 $
37 %
38 &
39 \'
40 (
41 )
42 *
43 +
44 ,
45 -
46 .
47 /
48 0
49 1
50 2
51 3
52 4
53 5
54 6
55 7
56 8
57 9
58 :
59 ;
60 "<"
61 =
62 >
63 ?
64 @
65 A
66 B
67 C
68 D
69 E
70 F
71 G
72 H
73 I
74 J
75 K
76 L
77 M
78 N
79 O
80 P
81 Q
82 R
83 S
84 T
85 U
86 V
87 W
88 X
89 Y
90 Z
91 [
92 \\
93 ]
94 ^
95 _
96 `
97 a
98 b
99 c
100 d
101 e
102 f
103 g
104 h
105 i
106 j
107 k
108 l
109 m
110 n
111 o
112 p
113 q
114 r
115 s
116 t
117 u
118 v
119 w
120 x
121 y
122 z
123 { [...]
124 |
125 } [...]
126 ~
127 \u{7F}Above we see the ASCII table generated by this Swift program. Some of the ASCII characters, like control and whitespace characters, are escaped.
for-loop with an open-ended range. So we loop from 1 to 127 inclusively.int into a UnicodeScalar. We use escaped() to get an escaped representation of each value.padding() with toLength to make our output table look better. This step is optional.import Foundation
// Header.
print("# ASCII")
// Use values between 0 and 127.
let min = 0
let max = 128
// Loop over all possible indexes.
for i in min..<max {
// Get UnicodeScalar.
let u = UnicodeScalar(i)!
// Build left part of display line.
let displayIndex = String(i).padding(toLength: 5, withPad: " ", startingAt: 0)
// Escape the UnicodeScalar for display.
let display = u.escaped(asASCII: true)
// Print this line.
let result = "\(displayIndex) \(display)"
print(result)
}This ASCII table is not perfect. The escaped() method on UnicodeScalar escapes all quotes, and this may not be needed.
In all general programming languages, we can generate ASCII tables. This helps us understand how characters are handled—in Swift we use the UnicodeScalar type.